Using standard alphabetical filing rules, which name is filed third: Paolo Reyes, Paulo Reyes, Pablo Reyes, Pedro Reyes?

The correct answer is B. Paulo Reyes

Indexed surname first, the filing order is REYES, Pablo → REYES, Paolo → REYES, Paulo → REYES, Pedro. The name filed third is Paulo Reyes. The surname is the same, so the first names decide: Pablo, Paolo, Paulo, Pedro. "Pab" comes before "Pao", which comes before "Pau", and all come before "Pe".